I'd summon a fairly high-level djinni around the 6th or 7th level. I'd try to find one that was well-behaved, maybe even Farqual. Djinni can do all the functions of an imp (and possibly a succubus) and more. Since they can change their form, they can be pretty much anything. It would be like owning a huge, sentient Swiss Army Knife that wants to kill you.
I could just command the djinni to transform into a sexy person if I ever needed company. And having a djinni is much more discreet and professional-sounding than summoning a succubus. Everyone Knows what a succubus is for, but a djinni could be for any purpose.
Person: "Oh you summoned a djinni. What task are you using it for?"
Me: "Oh, you know, all kinds of work and important stuff."
*In reality, uses the djinni to shape-shift into Pokémon so I can take pictures of them and then tell people I caught them all. Very important work, even if not everyone agrees.* :sun: